I've long entertained a dubious regard for the practice of lying to children about the existence of Santa Claus. Parents might claim that it serves to make children's lives more magical and exciting, but as a general rule, children are adequately equipped to create fantasies of their own without their parents' intervention. The two reasons I suspect rest at the bottom line are adherence to tradition, and finding it cute to see one's children believing ridiculous things.
Personally, I considered this to be a rather indecent way to treat one's own children, and have sometimes wondered whether a large proportion of conspiracy theorists owe their origins to the realization that practically all the adults in the country really are conspiring to deceive children for no tangible benefit. However, since I began frequenting this site, I've been exposed to the alternate viewpoint that this realization may be good for developing rationalists, because it provides children with the experience of discovering that they hold beliefs which are wrong and absurd, and that they must reject them.
So, how did the Santa deception affect you personally? How do you think your life might have been different without it? If your parents didn't do it to you, what are your impressions on the experience of not being lied to when most other children are?
Also, I promise to upvote anyone who links to an easy to register for community of conspiracy theorists where they would not be averse to being asked the same question.
I don't know, but I also don't think attempting to be all-embracing is necessarily a good idea.
If a community acts altruistically in the contexts that arise to be acted in, then new members of that community will tend to adopt altruistic values, and will in turn act altruistically in contexts that arise to be acted in. That's true regardless of what those contexts turn out to be.
They don't ever have to talk about altruism or look for ways to manifest altruism in contexts that don't seem to require it; indeed, doing so is one way that signaling ends up displacing doing.
Not that there's anything wrong with talking about one's values, any more than there's anything wrong with talking about one's tastes in food. But talking about food is a different kind of task than cooking or eating, and talking about altruism is different from behaving altruistically.
If a community gives up opportunities to behave altruistically in favor of talking, they communicate the value of talking rather than the value of altruism.
Incidentally, none of this is unique to altruism.